Here are the rest of the answers to the study guide since some classes didn't finish!

20. Earth’s crust = Aluminum

Earth’s atmosphere = Nitrogen

21. Doesn’t conduct electricity as well as metals, but better than nonmetals (kinda like metalloids).

22.Share their pooled e-, e- aren’t held tightly to one atom and move freely.

23.Element = atoms of only one type

Compound = made up of more than one element.

24.Both affect reaction rates.

Catalysts = substances that speed up reaction (without being used up or changed)

Inhibitors =substances that slow down a reaction

25. Non-metals do not conduct heat or electricity

Brittle

Dull

26. Circle in the middle with P p+ 15 n0 16

Each ring/energy level should have 2,8,5

27. Circle in the middle with Ar p+ 18 n0 22

Each ring/energy level should have 2,8,8

28. Circle in the middle with Be p+ 4 n0 5

Each ring/energy level should have 2,2

29. S with two dots on the right and two dots on the top and one dot on the left and one dot on the bottom

30. Na with one dot on the right

31. Si with one dot on each of the four sides

32. MgBr2 (2 is subscript)

Magnesium Bromide

33. BeF2 (2 is subscript)

Beryllium Fluoride

34. Ca4C2 (2 and 4 are subscripts)

Calcium Carbide

35. H2O (2 is subscript)
water